bump version and update changelog (#693)

* bump version and update changelog

* add changelog entries for the memory leak fixes

* backticks
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 213c397..fb8b84e 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -5,7 +5,7 @@
 The third digit is only for regressions.
 
 
-17.3.0 (UNRELEASED)
+17.3.0 (2017-09-14)
 -------------------
 
 
@@ -29,7 +29,10 @@
 Changes:
 ^^^^^^^^
 
-*none*
+- Fixed a memory leak in ``OpenSSL.crypto.CRL``.
+  `#690 <https://github.com/pyca/pyopenssl/pull/690>`_
+- Fixed a memory leak when verifying certificates with ``OpenSSL.crypto.X509StoreContext``.
+  `#691 <https://github.com/pyca/pyopenssl/pull/691>`_
 
 
 ----
diff --git a/src/OpenSSL/version.py b/src/OpenSSL/version.py
index 5ba33aa..274d24c 100644
--- a/src/OpenSSL/version.py
+++ b/src/OpenSSL/version.py
@@ -11,7 +11,7 @@
     "__title__", "__uri__", "__version__",
 ]
 
-__version__ = "17.3.0.dev0"
+__version__ = "17.3.0"
 
 __title__ = "pyOpenSSL"
 __uri__ = "https://pyopenssl.org/"